Step 1: Heat the oven to 425°F. Holding the leg of lamb with its meatiest side toward you, slash 5 times almost to the bone, at 1″ intervals.

Step 2: Combine the parsley, garlic, anchovies, capers, lemon zest, and bread crumbs in a bowl. Mix in the olive oil to make a paste. Push between the lamb slashes, reshape the meat, and tie with string.

Step 3: Scatter with rosemary, drizzle with a little olive oil, and roast for 20 minutes. Reduce the oven to 375°F and continue to roast for 45 minutes to 1 hour. Let rest under foil for 10 minutes.

Step 4: Strain the juices into a bowl and spoon off surface fat. Remove string and carve across lamb, parallel to the bone. Arrange on warm plates, drizzle with juices, and serve with lemon wedges.